CN115173693A - Three-phase active pfc control circuit, control signal generation method and topological structure - Google Patents
Three-phase active pfc control circuit, control signal generation method and topological structure Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/084—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Rectifiers (AREA)
Abstract
The embodiment of the application provides a three-phase active pfc control circuit, a control signal generation method and a topological structure, wherein the three-phase active pfc control circuit comprises: the sampling module is configured to acquire a reference voltage, a bus voltage, three-phase voltages and three-phase currents of the main circuit; the feedforward module comprises a voltage feedforward loop controller, and the voltage feedforward loop controller is connected with the sampling module; the control module is respectively connected with the voltage feedforward loop controller and the sampling module and is configured to output three-phase current output signals according to the reference voltage, the bus voltage, three-phase voltage and three-phase current of the main circuit and voltage feedforward quantity; and the PWM module is connected with the control module and is configured to output a control signal according to the three-phase current output signal. The air conditioner can effectively solve the problems of low power factor, high current harmonic content and serious electric pollution to a national power grid of the air conditioner, and advocates a green low-carbon idea.
Description
Technical Field
The application relates to the technical field of power supply circuits, in particular to a three-phase active pfc control circuit, a control signal generation method and a topological structure.
Background
The current commercial air conditioner mainly adopts a single-phase active pfc control circuit, and has the problems of low power factor, high current harmonic content and serious pollution to national power grid electricity.
Disclosure of Invention
The embodiment of the application provides a three-phase active pfc control circuit, a control signal generation method and a topology structure, which can effectively solve the problems.
In one aspect, the present embodiment provides a three-phase active pfc control circuit, including: the sampling module is configured to acquire a reference voltage, a bus voltage, three-phase voltages Va, vb and Vc and three-phase currents Ia, ib and Ic of the main circuit; the feedforward module comprises a voltage feedforward loop controller, the voltage feedforward loop controller is connected with the sampling module and is configured to output a voltage feedforward quantity VaFor according to the phase voltage Va; outputting a voltage feedforward quantity Vbfor according to the phase voltage Vb; outputting a voltage feedforward quantity VcFor according to the phase voltage Vc; the control module is respectively connected with the voltage feedforward loop controller and the sampling module and is configured to output three-phase current output signals IaOut, ibOut and IcOut according to reference voltage, bus voltage, three-phase voltages Va, vb and Vc and three-phase currents Ia, ib and Ic of the main circuit as well as voltage feedforward quantities VaFor, vbFor and VcFor; and the PWM module is connected with the control module and is configured to output control signals according to the three-phase current output signals IaOut, ibOut and ICout.
In some of these embodiments, the control module comprises: the voltage loop controller is connected with the sampling module and is configured to obtain an output value Vout according to the reference voltage and the bus voltage; the current loop controller is respectively connected with the sampling module, the voltage loop controller and the voltage feedforward loop controller and is configured to obtain a current output signal IaOut according to the phase current Ia, the phase voltage Va, the voltage feedforward quantity VaFor and the output value Vout; obtaining a current output signal IbOut according to the phase current Ib, the phase voltage Vb, the voltage feedforward quantity VvbFor and the output value Vout; and obtaining a current output signal IOut according to the phase current Ic, the phase voltage Vc, the voltage feedforward quantity Vcfor and the output value Vout.
In some of these embodiments, include: the voltage loop controller is connected with the sampling module and is configured to obtain an output value Vout according to the reference voltage and the bus voltage; the multiplier is connected with the voltage loop controller, the voltage feedforward loop controller and the sampling module and is configured to obtain a reference current IaRef according to the phase voltage Va, the voltage feedforward quantity VaFor and the output value Vout; obtaining a reference current IbRef according to the phase voltage Vb, the voltage feedforward quantity VvbFor and the output value Vout; obtaining a reference current IcRef according to the phase voltage Vc, the voltage feedforward quantity Vcfor and the output value Vout; the current loop controller is respectively connected with the sampling module and the multiplier and is configured to output a current output signal IaOut according to the phase current Ia and the reference current IaRef; outputting a current output signal IbOut according to the phase current Ib and the reference current IbRef; and outputting a current output signal IcOut according to the phase current Ic and the reference current IcRef.
In some embodiments, the feed-forward module further comprises a duty ratio feed-forward loop controller, the duty ratio feed-forward loop controller is respectively connected with the sampling module and the PWM module, and the duty ratio feed-forward loop controller is configured to output a duty ratio DaFor according to the phase voltage Va and the reference voltage; outputting a duty ratio DbFor according to the phase voltage Vb and the reference voltage; and outputting a duty ratio Dcfor according to the phase voltage Vc and the reference voltage; the PWM module is configured to output a control signal according to the current output signals IaOut, ibOut, icOut and the duty cycles DaFor, dbFor, dcFor.
In some of these embodiments, the PWM module comprises: the first adder is respectively connected with the control module and the duty ratio feedforward loop controller and is configured to adjust the current output signals IaOut, ibOut and IcOut according to duty ratios DaFor, dbFor and DcFor to obtain a first control instruction; the signal conversion unit is connected with the first adder and is configured to integrate the first control instruction to obtain a final control instruction; and the PWM modulation unit is connected with the signal conversion unit and is configured to modulate the final control instruction and output a control signal.
In some of these embodiments, the PWM module further comprises: the Zero-sequence component injector is connected with the first adder and is configured to obtain a Zero-sequence component Zero according to a control command input by the first adder; the second adder is respectively connected with the Zero sequence component injector, the first adder and the signal conversion unit and is configured to integrate the first control instruction and the Zero sequence component Zero to obtain a second control instruction; the signal conversion unit is configured to integrate the second control instruction to obtain a final control instruction.
In some of these embodiments, the sampling module is further configured to filter and/or per-unit process the collected data.
On the other hand, the present embodiment provides a three-phase pfc control signal generation method applied to the three-phase active pfc control circuit of any one of the above embodiments, the method including: acquiring reference voltage, bus voltage, three-phase voltages Va, vb and Vc and three-phase currents Ia, ib and Ic of a main circuit through a sampling module; outputting a voltage feedforward quantity VaFor according to the three-phase voltage Va through a voltage feedforward loop controller; outputting a voltage feedforward quantity Vbfor according to the three-phase voltage Vb; outputting a voltage feedforward quantity Vcfor according to the three-phase voltage Vc; through a control module, current output signals IaOut, ibOut and IcOut are output according to reference voltage, bus voltage, three-phase voltages Va, vb and Vc of a main circuit, three-phase currents Ia, ib and Ic and voltage feed-forward quantities VaFor, vbFor and VcFor; and outputting a control signal according to the current output signals IaOut, ibOut and IcOut through the PWM module.
In some of these embodiments, the method further comprises: outputting a duty ratio DaFor according to the three-phase voltage Va and the reference voltage through a duty ratio feedforward loop controller, outputting a duty ratio Dbfor according to the three-phase voltage Vb and the reference voltage, and outputting a duty ratio Dcfor according to the three-phase voltage Vc and the reference voltage; and outputting a control signal through the PWM module according to the current output signals IaOut, ibOut and IOut and the duty ratios DaFor, dbFor and DcFor.
In some of these embodiments, the method further comprises the steps of: the current output signals IaOut, ibOut and IcOut and the duty ratios DaFor, dbFor and DcFor are respectively sent to a Zero-sequence component injector to obtain output values Zero; adding the output value Zero with the current output signal IaOut and the duty ratio DaFor to obtain a first output value; the output value Zero is subjected to addition operation with the current output signal IbOut and the duty ratio DcFor to obtain a second output value; adding the output value Zero with the current output signal IcOut and the duty ratio DcFor to obtain a third output value; sending the first output value, the second output value and the third output value to a PWM module; the PWM module outputs a control signal.
The present embodiment also provides a topology structure comprising a main circuit and the three-phase active pfc control circuit of any of the above embodiments; the main circuit comprises: the first branch circuit is connected with a first parallel structure in series, and the first parallel structure comprises a first switch and a second switch which are connected in parallel; the second branch circuit is connected with a second parallel structure in series, and the second parallel structure comprises a third switch and a fourth switch which are connected in parallel; the third branch circuit is connected with a third parallel structure in series, and the third parallel structure comprises a fifth switch and a sixth switch which are connected in parallel; the three-phase active pfc control circuit respectively acquires phase currents and phase voltages of the first branch, the second branch and the third branch, and controls on and off of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch.
Has the advantages that:
the three-phase active pfc control circuit provided by the embodiment adopts three-phase belt feedforward control, can effectively solve the problems of low power factor, large current harmonic content and serious electric pollution to a national power grid of the air conditioner, advocates a green low-carbon idea at the same time, and prepares for index promotion of a national commercial air conditioner.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of a three-phase active pfc control circuit according to some embodiments of the present application;
FIG. 2 is a circuit diagram of a topology provided by some embodiments of the present application;
FIG. 3 is a graph of input voltage, input current, bus voltage waveforms for a pfc-free correction method;
FIG. 4 is a graph of input voltage, input current, bus voltage waveforms for a passive pfc correction method;
FIG. 5 is a graph of the input voltage, input current, bus voltage waveforms for the active pfc correction method of the present application;
FIG. 6 is a plot of PF value measurements (power factor) for the active pfc correction method of the present application;
FIG. 7 is a graph of the THD value measurement (total harmonic distortion) for the active pfc correction method of the present application;
FIG. 8 is a graph of input voltage and input current waveforms without a feed forward loop;
FIG. 9 is a graph of input voltage and input current waveforms for the present application with a feed forward loop;
FIG. 10 is a waveform diagram of zero sequence component injection of the present application;
reference numerals are as follows:
10. a sampling module; 201. a voltage feed forward loop controller; 202. a duty cycle feedforward loop controller; 301. a voltage loop controller; 302. a current loop controller; 303. a multiplier; 40. a PWM module; 401. a first adder; 402. a signal conversion unit; 403. a PWM modulation unit; 404. a zero sequence component injector; 405. a second adder.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
"A and/or B" includes the following three combinations: a alone, B alone, and a combination of A and B.
The use of "adapted to" or "configured to" in this application means open and inclusive language that does not exclude devices adapted to or configured to perform additional tasks or steps. Additionally, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or values beyond those stated.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
In one aspect, the present embodiment provides a three-phase active pfc control circuit, as shown in fig. 1, including a sampling module 10, a feed-forward module, a control module, and a PWM module 40. The sampling module 10 is configured to obtain a reference voltage Vref, a bus voltage Vdc, three-phase voltages Va, vb, vc and three-phase currents Ia, ib, ic of the main circuit; when three-phase voltages Va, vb and Vc of the main circuit are obtained, any two-phase voltage of the main circuit can be selectively sampled, then another phase voltage is obtained in a calculation mode, or the three-phase voltages of the main circuit can be directly selected to be sampled, and the three-phase voltages are respectively obtained; the three-phase current is obtained in the same way as the three-phase voltage, and any two-phase current can be selectively sampled or the three-phase current can be directly sampled.
The feedforward module comprises a voltage feedforward loop controller 201, the voltage feedforward loop controller 201 is connected with the sampling module 10, and is used for acquiring three-phase voltages Va, vb and Vc acquired by the sampling module 10, and respectively processing the phase voltages to acquire output value voltage feedforward quantities VaFor, vbFor and VcFor, specifically, the existing voltage feedforward compensation mode is adopted, the phase voltage Va is input, and the output value voltage feedforward quantity VaFor is acquired; inputting a phase voltage Vb to obtain an output value voltage feedforward quantity Vbfor; inputting a phase voltage Vc to obtain an output value voltage feedforward quantity VcFor; the number of the voltage feedforward loop controllers 201 is not limited, and three-phase voltage data are transmitted through three separate circuits and then transmitted to the voltage feedforward loop controllers 201. In the voltage feedforward loop controller 201, one voltage feedforward loop controller 201 may perform processing respectively to obtain corresponding output values, or multiple (for example, two, three, or even more) voltage feedforward loop controllers may perform processing respectively to obtain corresponding output values. Through the arrangement of the voltage feedforward loop controller 201, the constant power output at the rear end can be realized, the working range of the input voltage is widened, the output voltage is stabilized, and the load regulation rate is improved. The voltage feedforward element divides the voltage loop transfer function by the square of the effective value of the input voltage, and also eliminates or weakens the coupling effect of the input voltage on the controller.
The control module is respectively connected with the voltage feedforward loop controller 201 and the sampling module 10, the sampling module 10 sends the acquired reference voltage Vref, the bus voltage Vdc, the three-phase voltages Va, vb and Vc of the main circuit and the three-phase current Ia, ib and Ic of the main circuit to the control module, and the three-phase voltage feedforward quantities VaFor, vvbFor and VcFor output by the voltage feedforward loop controller 201 are sent to the control module; the control module processes the data to obtain current output signals IaOut, ibOut and IOut.
The PWM module 40 is connected to the control module, and the PWM module 40 receives and processes the current output signals IaOut, ibOut, and IcOut output by the control module, and finally outputs a control signal for controlling the main circuit.
In some of these embodiments, the control module comprises a voltage loop controller 301 and a current loop controller 302; the voltage loop controller 301 is connected to the sampling module 10, and is configured to obtain an output value Vout according to a reference voltage Vref and a bus voltage Vdc according to a control manner of the voltage loop. The input variables of the voltage loop controller 301 are a reference voltage Vref and a bus voltage Vdc, respectively, so that the bus voltage Vdc is stabilized near the reference voltage Vref, and a calculation frequency of 10KHz is adopted.
The current loop controller 302 is respectively connected with the sampling module 10, the voltage loop controller 301 and the voltage feedforward loop controller 201, and respectively obtains three-phase currents Ia, ib and Ic, three-phase voltages Va, vb and Vc, three-phase voltage feedforward quantities VaFor, vbFor and VcFor and an output value Vout obtained by the sampling module 10 according to the control mode of the current loop, so as to obtain a current output signal; specifically, a current output signal IaOut is obtained according to the phase current Ia, the phase voltage Va, the voltage feed-forward quantity VaFor and the output value Vout; obtaining a current output signal IbOut according to the phase current Ib, the phase voltage Vb, the voltage feedforward quantity VvbFor and the output value Vout; and obtaining a current output signal IOut according to the phase current Ic, the phase voltage Vc, the voltage feedforward quantity Vcfor and the output value Vout. The current loop controller 302 is correspondingly connected with three circuits, and the specific setting mode is similar to that of the voltage feedforward loop controller 201, and is not described again. The link mainly has the function of enabling input current to follow the phase of input voltage, achieving the effect of power factor correction, and calculating the frequency of 50KHz.
In other embodiments, the control module includes a voltage loop controller 301 and a current loop controller 302, and a multiplier 303. The voltage loop controller 301 is connected with the sampling module 10, the current loop controller 302 is connected with the sampling module 10, and the multiplier 303 is respectively connected with the voltage loop controller 301, the voltage feedforward loop controller 201, the sampling module 10 and the current loop controller 302. The multiplier 303 obtains a reference current by obtaining three-phase voltage Va, vb, vc, three-phase voltage feed-forward quantities VaFor, vbFor, vcFor and an output value Vout; specifically, a reference current IaRef is obtained according to the phase voltage Va, the voltage feedforward quantity VaFor and the output value Vout; obtaining a reference current IbRef according to the phase voltage Vb, the voltage feedforward quantity VvbFor and the output value Vout; and obtaining the reference current IcRef according to the phase voltage Vc, the voltage feedforward quantity VcFor and the output value Vout. The multiplier 303 is correspondingly connected with three circuits, and the specific configuration is similar to that of the voltage feedforward loop controller 201 and the current loop controller 302, and is not described again. The output Vout of the voltage loop, the output VaFor, vbFor and VcFor of the voltage feedforward loop and the ABC three-phase voltages VaFor, vbFor and Vc are input to the multiplier 303 for ABC three-path processing respectively, phase voltage information VaFor, vbFor and Vc and voltage feedforward loop signals VaFor, vbFor and VcFor are superposed on the output instruction Vout of the voltage loop controller 301 through the multiplier 303, and the calculated output is input to the current loop.
The current loop controller 302 obtains current output signals IaOut, ibOut, and IcOut according to the reference currents IaRef, ibRef, and IcRef and the three-phase currents Ia, ib, and Ic at this time; specifically, the current output signal IaOut is output according to the phase current Ia and the reference current IaRef; outputting the current output signal IbOut according to the phase current Ib and the reference current IbRef; and outputting the current output signal IcOut according to the phase current Ic and the reference current IcRef. The current loop controller 302 is used for superposing phase voltage information Va, vb, vc and voltage feedforward loop signals VaFor, vbFor, vcFor through a front end multiplier 303, controlling actual sampling currents Ia, ib, ic to follow the reference instructions of iaaref, ibRef, icRef, and finally outputting the instructions of IaOut, ibOut, and IcOut.
In some embodiments, the feed-forward module further includes a duty ratio feed-forward loop controller 202, the duty ratio feed-forward loop controller 202 is connected to the sampling module 10 and the PWM module 40, the sampling module 10 sends the obtained three-phase voltages Va, vb, vc and the reference voltage Vref to the duty ratio feed-forward loop controller 202, and the duty ratio feed-forward loop controller 202 processes and outputs duty ratio null output values DaFor, dbFor, and DcFor; specifically, a phase voltage Va and a reference voltage Vref are input to the feedforward loop controller, and a duty ratio DaFor is output; inputting a phase voltage Vb and a reference voltage Vref to a feedforward loop controller, and outputting a duty ratio DbFor; inputting a phase voltage Vc and a reference voltage Vref to a feedforward loop controller, and outputting a duty ratio DcFor; the duty cycles DaFor, dbFor, and DcFor are then sent into the PWM module 40, respectively. The PWM module 40 finally outputs a control signal according to the duty ratios DaFor, dbFor, and DcFor output by the duty ratio feedforward loop controller 202 and the current output signals IaOut, ibOut, and IcOut output by the control module. Due to circuit delays of the switching transistors, the characteristics of the voltage loop controller 301, capacitance, etc., the input current leads the input voltage. A duty ratio feedforward link is introduced to bypass the voltage loop controller 301 and the current loop controller 302, and a voltage signal is directly fed back to the rear-end duty ratio, so that the corresponding speed of the controller is increased, the hysteresis of the voltage is compensated, the hysteresis of the input voltage can be reduced, and the power factor is improved.
In some of the embodiments, the PWM module 40 includes a first adder 401, a signal conversion unit 402, and a PWM modulation unit 403; the first adder 401 is connected to the control module and the duty ratio feedforward loop controller 202, and the first adder is correspondingly connected to three circuits, and the specific setting mode is similar to that of the voltage feedforward loop controller 201, the current loop controller 302, and the multiplier 303, and is not described again. The first adder 401 receives the duty ratios DaFor, dbFor, and DcFor output by the duty ratio feedforward loop controller 202 and the current output signals IaOut, ibOut, and IcOut output by the control module, respectively, adjusts the duty ratios DaFor, dbFor, and DcFor, and then sends the adjusted current output signals IaOut, ibOut, and IcOut to the signal conversion unit 402.
The signal conversion unit 402 is connected to the first adder 401, and is configured to receive the current signal adjusted by the first adder 401 and perform integration. The module is responsible for converting the final control instructions of three abc paths into corresponding values of PWM (pulse width modulation) related registers in the DSP. In other examples, the control instructions may be further clipped to prevent data overflow.
The PWM modulation unit 403 is connected to the signal converter, and obtains the control command integrated by the signal conversion unit 402 to modulate, and outputs the finally required control signal. In a specific example, the PWM module 40 inside the DSP chip may be used to perform signal modulation by using a triangular wave, and the modulation frequency is 50KHz.
In some of these embodiments, the PWM module 40 further includes a zero sequence component injector 404 and a second summer 405; the Zero-sequence component injector 404 is connected to the first adder 401, and is configured to obtain a first control instruction output by the first adder 401, and process the first control instruction to obtain an output value Zero-sequence component Zero. In a three-phase symmetrical system, a certain amount of third harmonic is injected, the utilization rate of the converter can be improved, the injected third harmonic can be mutually offset in the system, the modulation quality cannot be influenced, and finally, the modulation effect similar to SVPWM is obtained. However, the injection of the third harmonic involves trigonometric function calculation, which is not beneficial to the operation efficiency of the DSP, so that the injection of the third harmonic can be replaced by zero sequence component. As shown in the figure, the input quantities are A, B and C, and the output commands Zero are respectively superposed into the three-phase modulation signals of ABC. The second adder 405 is respectively connected to the Zero-sequence component injector 404, the first adder 401 and the signal conversion unit 402, and is configured to integrate the first control instruction and the Zero-sequence component Zero to obtain a second control instruction; the signal conversion unit 402 is configured to integrate the second control instruction to obtain a final control instruction.
In some of these embodiments, the sampling module 10 is further configured to filter and/or per-unit process the acquired data. The module input variables are reference voltage Vref, bus voltage Vdc, phase a voltage Va, phase a current Ia, phase b voltage Vb, and phase b current Ib, respectively. According to the characteristic of DSP offline signal processing, in order to reduce interference, signals need to be sampled after the high-power switching devices such as IGBT and the like are avoided. Through setting the per unit value, the dimension is unified, and the post-level calculation is facilitated. Processed output values Vref, vdc, va, ia, vb, ib are obtained.
On the other hand, the present embodiment further provides a method for generating a three-phase pfc control signal, which is applied to the three-phase active pfc control circuit in any one of the foregoing embodiments, and the method specifically includes the following steps:
acquiring reference voltage, bus voltage, three-phase voltages Va, vb and Vc and three-phase currents Ia, ib and Ic of a main circuit through a sampling module 10;
outputting a voltage feedforward quantity VaFor according to the three-phase voltage Va through a voltage feedforward loop controller 201; outputting a voltage feedforward quantity Vbfor according to the three-phase voltage Vb; outputting a voltage feedforward quantity Vcfor according to the three-phase voltage Vc;
outputting current output signals IaOut, ibOut and IOut through a control module according to reference voltage, bus voltage, three-phase voltage Va, vb and Vc of a main circuit, three-phase current Ia, ib and Ic and voltage feedforward quantities VaFor, vbFor and VcFor;
the PWM module 40 outputs control signals according to the current output signals IaOut, ibOut, icOut.
In some embodiments, the three-phase pfc control signal generation method further comprises:
outputting a duty ratio DaFor according to the three-phase voltage Va and the reference voltage through a duty ratio feedforward loop controller 202, outputting a duty ratio DbFor according to the three-phase voltage Vb and the reference voltage, and outputting a duty ratio Dcfor according to the three-phase voltage Vc and the reference voltage;
outputting control signals according to the current output signals IaOut, ibOut, icOut through the PWM module 40, including:
the PWM module 40 outputs a control signal according to the current output signals IaOut, ibOut, icOut and the duty ratios DaFor, dbFor, dcFor.
In some of these embodiments, the method for generating a three-phase pfc control signal further comprises the steps of:
the current output signals IaOut, ibOut, icOut and duty ratios DaFor, dbFor, dcFor are respectively sent to the Zero-sequence component injector 404 to obtain an output value Zero;
adding the output value Zero with the current output signal IaOut and the duty ratio DaFor to obtain a first output value;
the output value Zero is subjected to addition operation with the current output signal IbOut and the duty ratio DcFor to obtain a second output value;
adding the output value Zero with the current output signal IcOut and the duty ratio DcFor to obtain a third output value;
sending the first output value, the second output value and the third output value to the PWM module 40;
the PWM module 40 outputs a control signal.
As shown in fig. 3 to 5, a comparison graph of the voltage waveforms of the input voltage, the input current and the bus of the three-phase active control circuit of the present application is shown without a pfc correction scheme and a passive pfc correction scheme for the phase a under the same load, so that the power factor of the three-phase active control circuit of the present application can be greatly improved. As shown in fig. 6, the power factor of the three-phase active control circuit of the present application is as high as 99.5%. As shown in fig. 7, the total harmonic distortion of the three-phase active control circuit of the present application is 0.85%. As shown in fig. 8 and 9, the waveforms of duty-free feedforward are compared with the input voltage and input current waveforms of the feedforward loop in the present application. As shown in fig. 10, which is a schematic diagram of a waveform of zero sequence component injection of the three-phase active control circuit of the present application, the capacity of the converter can be improved by the injection of the zero sequence component.
The present embodiment also provides a topology, as shown in fig. 2, comprising a main circuit and the three-phase active pfc control circuit of any of the above embodiments; the main circuit comprises:
the first branch circuit is connected with a first parallel structure in series, and the first parallel structure comprises a first switch and a second switch which are connected in parallel; the second branch is connected with a second parallel structure in series, and the second parallel structure comprises a third switch and a fourth switch which are connected in parallel; the third branch circuit is connected with a third parallel structure in series, and the third parallel structure comprises a fifth switch and a sixth switch which are connected in parallel;
the three-phase active pfc control circuit respectively acquires phase currents and phase voltages of the first branch circuit, the second branch circuit and the third branch circuit, and controls the on-off of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch.
In some embodiments, the first branch, the second branch and the third branch are respectively provided with a pfc inductor in series.
In some embodiments, the first branch, the second branch and the third branch are connected in series to form a capacitor.
The three-phase active pfc control circuit, the control signal generation method and the topology provided by the embodiment of the present application are introduced in detail, and a specific example is applied in the present application to explain the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (11)
1. A three-phase active pfc control circuit, comprising:
the sampling module is configured to acquire a reference voltage, a bus voltage, three-phase voltages Va, vb and Vc and three-phase currents Ia, ib and Ic of the main circuit;
the feedforward module comprises a voltage feedforward loop controller, the voltage feedforward loop controller is connected with the sampling module and is configured to output a voltage feedforward quantity VaFor according to the phase voltage Va; outputting a voltage feedforward quantity Vbfor according to the phase voltage Vb; outputting a voltage feedforward quantity Vcfor according to the phase voltage Vc;
the control module is respectively connected with the voltage feedforward loop controller and the sampling module and is configured to output three-phase current output signals IaOut, ibOut and IcOut according to reference voltage, bus voltage, three-phase voltages Va, vb and Vc of a main circuit, three-phase currents Ia, ib and Ic and voltage feedforward quantities VaFor, vbFor and VcFor;
and the PWM module is connected with the control module and is configured to output control signals according to the three-phase current output signals IaOut, ibOut and IcOut.
2. A three-phase active pfc control circuit according to claim 1, characterized in that the control module comprises:
the voltage loop controller is connected with the sampling module and is configured to obtain an output value Vout according to a reference voltage and a bus voltage;
the current loop controller is respectively connected with the sampling module, the voltage loop controller and the voltage feedforward loop controller and is configured to obtain a current output signal IaOut according to the phase current Ia, the phase voltage Va, the voltage feedforward quantity VaFor and the output value Vout; obtaining a current output signal IbOut according to the phase current Ib, the phase voltage Vb, the voltage feedforward quantity VvbFor and the output value Vout; and obtaining a current output signal IOut according to the phase current Ic, the phase voltage Vc, the voltage feedforward quantity Vcfor and the output value Vout.
3. A three-phase active pfc control circuit according to claim 1, characterized in that it comprises:
the voltage loop controller is connected with the sampling module and is configured to obtain an output value Vout according to the reference voltage and the bus voltage;
the multiplier is connected with the voltage loop controller, the voltage feedforward loop controller and the sampling module and is configured to obtain a reference current IaRef according to the phase voltage Va, the voltage feedforward quantity VaFor and the output value Vout; obtaining a reference current IbRef according to the phase voltage Vb, the voltage feedforward quantity VvbFor and the output value Vout; obtaining a reference current IcRef according to the phase voltage Vc, the voltage feedforward quantity Vcfor and the output value Vout;
a current loop controller, respectively connected to the sampling module and the multiplier, configured to output the current output signal IaOut according to the phase current Ia and the reference current IaRef; outputting a current output signal IbOut according to the phase current Ib and the reference current IbRef; and outputting a current output signal IcOut according to the phase current Ic and the reference current IcRef.
4. A three-phase active pfc control circuit according to claim 1, wherein the feed forward module further comprises a duty cycle feed forward loop controller connected to the sampling module and the PWM module respectively, the duty cycle feed forward loop controller being configured to output a duty cycle DaFor in dependence on the phase voltage Va and a reference voltage; outputting a duty ratio DbFor according to the phase voltage Vb and the reference voltage; and outputting a duty ratio Dcfor according to the phase voltage Vc and the reference voltage;
the PWM module is configured to output a control signal according to the current output signals IaOut, ibOut and IcOut and duty ratios DaFor, dbFor and DcFor.
5. A three-phase active pfc control circuit according to claim 4, characterized in that the PWM module comprises:
the first adder is respectively connected with the control module and the duty ratio feedforward loop controller and is configured to adjust the current output signals IaOut, ibOut and IcOut according to the duty ratios DaFor, dbFor and DcFor to obtain a first control instruction;
the signal conversion unit is connected with the first adder and is configured to integrate the first control instruction to obtain a final control instruction;
and the PWM modulation unit is connected with the signal conversion unit, and is configured to modulate the final control instruction and output the control signal.
6. A three-phase active pfc control circuit according to claim 5, characterized in that the PWM module further comprises:
the Zero-sequence component injector is connected with the first adder and is configured to obtain a Zero-sequence component Zero according to a control command input by the first adder;
the second adder is respectively connected with the Zero-sequence component injector, the first adder and the signal conversion unit and is configured to integrate the first control instruction and the Zero-sequence component Zero to obtain a second control instruction;
the signal conversion unit is configured to integrate the second control instruction to obtain a final control instruction.
7. A three-phase active pfc control circuit according to claim 1, characterized in that the sampling module is further configured to filter and/or per-unit process the acquired data.
8. A three-phase pfc control signal generation method applied to the three-phase active pfc control circuit according to any one of claims 1 to 7, the method comprising:
acquiring reference voltage, bus voltage, three-phase voltages Va, vb and Vc and three-phase currents Ia, ib and Ic of a main circuit through the sampling module;
outputting a voltage feedforward quantity VaFor according to the three-phase voltage Va through the voltage feedforward loop controller; outputting a voltage feedforward quantity Vbfor according to the three-phase voltage Vb; outputting a voltage feedforward quantity Vcfor according to the three-phase voltage Vc;
through the control module, current output signals IaOut, ibOut and IcOut are output according to reference voltage, bus voltage, three-phase voltages Va, vb and Vc of a main circuit, three-phase currents Ia, ib and Ic and voltage feed-forward quantities VaFor, vbFor and VcFor;
and outputting a control signal according to the current output signals IaOut, ibOut and IOut through the PWM module.
9. The method of generating a three-phase pfc control signal according to claim 8, further comprising:
outputting a duty ratio DaFor according to the three-phase voltage Va and the reference voltage through the duty ratio feedforward loop controller, outputting a duty ratio Dbfor according to the three-phase voltage Vb and the reference voltage, and outputting a duty ratio Dcfor according to the three-phase voltage Vc and the reference voltage;
and outputting a control signal through the PWM module according to the current output signals IaOut, ibOut and IOut and the duty ratios DaFor, dbFor and DcFor.
10. Method for the generation of a three-phase pfc control signal according to claim 9, characterized in that it comprises the following further steps:
the current output signals IaOut, ibOut and IcOut and the duty ratios DaFor, dbFor and DcFor are respectively sent to the Zero-sequence component injector to obtain an output value Zero;
adding the output value Zero with the current output signal IaOut and the duty ratio DaFor to obtain a first output value;
the output value Zero is added with the current output signal IbOut and the duty ratio DcFor to obtain a second output value;
adding the output value Zero with the current output signal IcOut and the duty ratio DcFor to obtain a third output value;
sending the first output value, the second output value and the third output value to the PWM module;
the PWM module outputs a control signal.
11. Topology, characterized in that it comprises a main circuit and a three-phase active pfc control circuit according to any of claims 1 to 7; the main circuit comprises:
the first branch circuit is connected with a first parallel structure in series, and the first parallel structure comprises a first switch and a second switch which are connected in parallel;
the second branch circuit is connected with a second parallel structure in series, and the second parallel structure comprises a third switch and a fourth switch which are connected in parallel;
the third branch circuit is connected with a third parallel structure in series, and the third parallel structure comprises a fifth switch and a sixth switch which are connected in parallel;
the three-phase active pfc control circuit respectively acquires phase currents and phase voltages of the first branch circuit, the second branch circuit and the third branch circuit, and controls on and off of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch.
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| CN116582005A (en) * | 2023-04-18 | 2023-08-11 | 西安麦格米特电气有限公司 | Electric energy conversion circuit, electric energy conversion method and electric energy conversion equipment |
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| CN116582005A (en) * | 2023-04-18 | 2023-08-11 | 西安麦格米特电气有限公司 | Electric energy conversion circuit, electric energy conversion method and electric energy conversion equipment |
| CN116582005B (en) * | 2023-04-18 | 2023-12-08 | 西安麦格米特电气有限公司 | Electric energy conversion circuit, electric energy conversion method and electric energy conversion equipment |
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